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Real Estate Held for Sale in Consolidated VIEs (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Investment [Line Items] |  |  |  |  |  |
Real estate held for sale before accumulated depreciation and amortization |  | $ 29,502,000 |  | $ 29,502,000 |  | $ 64,202,000
Riverchase Landing | VIE, Primary Beneficiary |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |
Gain on sale | $ 2,300,000 |  |  |  |  |
Land |  | 2,650,000 |  | 2,650,000 |  | 7,000,000
Building and improvements |  | 25,944,000 |  | 25,944,000 |  | 53,468,000
Furniture, fixtures and equipment |  | 860,000 |  | 860,000 |  | 2,150,000
Lease intangible |  | 2,802,000 |  | 2,802,000 |  | 5,340,000
Real estate held for sale before accumulated depreciation and amortization |  | 32,256,000 |  | 32,256,000 |  | 67,958,000
Accumulated depreciation |  | (418,000) |  | (418,000) |  | (647,000)
Accumulated amortization of lease intangible |  | (2,336,000) |  | (2,336,000) |  | (3,109,000)
Real estate held for sale in consolidated variable interest entities |  | 29,502,000 |  | 29,502,000 |  | $ 64,202,000
Depreciation |  | 0 | $ 500,000 | 0 | $ 500,000 |
Amortization |  | $ 0 |  | $ 0 | $ 2,200,000 |

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